package com.itheima.xixi.filter;

import com.alibaba.fastjson.JSON;
import com.itheima.xixi.common.BaseContext;
import com.itheima.xixi.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "LonginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    public static final AntPathMatcher antPathMatcher =new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        String requestURI = request.getRequestURI();

        log.info("拦截到请求:{}", requestURI);

        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/favicon.ico",
                "/user/sendMsg",
                "/user/login"
        };

        boolean check = check(urls, requestURI);

        if (check) {
            log.info("本次请求{}不用处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        //4-1判断后台登陆状态
        if (request.getSession().getAttribute("employee") != null) {
            log.info("用户已经登陆，用户id为:{}", request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            filterChain.doFilter(request, response);
            return;
        }
        //4-2判断移动端登陆状态
        if (request.getSession().getAttribute("user") != null) {
            log.info("用户已经登陆，用户id为:{}", request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            filterChain.doFilter(request, response);

            return;
        }

        log.info("用户未登录！");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
    }

    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = antPathMatcher.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
    }
}
